Furnace door



July 13, 1965 c. B. MURTON 3,194,192

FURNACE DOOR Filed Nov. 27 1961 2 Sheets-Sheet l //VVENT0R CRAWFORD aMURTO/V July 13; 1965 c. B. MURTON FURNACE DOOR Filed Nov. 27 1961 3 fiI61 50 A x 26 I r: w 30 26 50 4/ 3 2 Sheets-Sheet 2 Al/a ny UnitedStates Patent 3,194,192 FURNACE DUOR Crawford B. Murton, 1906 BrushclifiRoad, Pittsburgh 21, Pa. Filed Nov. 27, 1961, Ser. No. 155,046 3 Claims.(Cl. 110-173) This invention relates to a door and more particularly toa furnace door. The side of said door adjacent the furnace heatingchamber is generally termed the hot face and the side away from theheating chamber the cold face. The hot face of the door is subject tohigh temperatures and tends to deteriorate. For that reason furnacedoors of which I have knowledge have a Water chamber for providingcooling water. This has various disadvantages. Supplying water is alwaysexpensive and it is often difficult to connect the supply and drainlines without interfering with the operation of surrounding equipment.Another disadvantage is that the water supply lines or water chamber mayclog up or there may be a failure of water supply. In either case thereis grave danger that the door will be damaged or destroyed.

It is therefore an object of ,my invention to provide a structure forclosing a furnace opening which can withstand high heat without the useof cooling water.

Another object is too provide a furnace door which is air cooled.

Still another object is to provide a special metal clad brick for usewith my improved door.

These and other objects will be apparent after referring to thefollowing description and attached drawings, in which:

FIGURE 1 is a perspective View of my improved door with parts brokenaway;

FIGURE 2 is an elevation of the door locking toward its cold face;

FIGURE 3 is an end view of the door with parts broken away;

FIGURE 4 is a and FIGURE 5 is a fragmentary view of a modified doorutilizing the brick of FIGURE 4.

Referring to FIGURES 1, 2 and 3 of the drawings reference numeral 2indicates the outside frame of the door which is preferably made up oftwo steel side plates 4 and 6 connected at their top on the hot face bymeans of a steel plate 8 welded thereto. Bottom plates 10 and 12 at thehot and cold faces respectively extend between and are welded to plates4 and 6. Holes 14, 16 and 18 are provided in plate 4 in alignment withsimilar holes in plate 6. An inside frame 20 is made up of angles 22arranged with one leg forming the outer wall of the frame 20 and theother leg forming a backing for receiving a sheet of expanded metal 24.Lugs 26 with holes 28 therein are provided on each corner of the frame20. The width of the frame 20 is substantially equal to the distancebetween plates 4 and 6 so that it can be received therebetween on thecold face thereof. Bolts 30 passing through holes 14, 16 and 28 fastenthe frame 20 to frame 2. Threaded studs 32 are welded to the top andbottom of the frame 20 and extend toward the cold face. Insulating brick34 are placed in the frame 20 against metal sheet 24 and a secondexpanded metal sheet 36 is fastened to the cold face of the frame 20 bymeans of bars 38 having holes 40 therein for receiving studs 32. Nuts 41secured to studs 32 hold the bars in position. An opening 42 is providedthrough sheets 24 and 36 and insulating bricks 34. Metal clad high dutyrefractory bricks 44 are received in opening 46 at the hot face of frame2 with an opening 48 therethrough in alignment with opening 42. Bars 50are welded to perspective view of a special brick;

' clad refractory bricks in 3,194,192 Patented July 13, 1965 the metalcladding of bricks 44 and the assembly is held in place by a threadedrod 52 passing through holes 18 with nuts 54 being threaded on the endsthereof. If desired at least some of the bricks 44 may be weldedtogether to make a stronger assembly.

In assembly, the meal clad bricks 44 with the bars Ell welded theretoare placed in position and the rod 52 passed therough holes 18 to holdthe bricks 44 in position on the hot face of the door. Sheets 24 and 36and bricks 34 are positioned in inner frame 20 and held in place by bars38. The inner frame 20 may be attached to outer frame 2 either before orafter assembly of the parts therein. It will be seen that a horizontalopening 56 is provided adjacent the bottom of the door from the coldface thereof and that a vertical opening 58 extends upwardly fromopening 56 to the top of the door. Thus, air cancirculate through thedoor to cool the hot face to an extent that will protect it from damagewhile the insulating bricks 34 prevent excessive heat from passing tothe cold face of the door, thus protecting workmen from being burned.Aligned openings 42 and 48 provide the usual peep hole. Fittings forraising and lowering the door are provided for the door in the usualmanner.

In the embodiment of FIGURES 4 and 5 a special metal clad brick 60 isprovided. Brick 60 includes a basic or other high duty refractory body62 having a recess 64 in one side thereof and metal cladding 66 aroundthe periphery thereof. The cladding 66 may be made in two pieces asshown or in one piece. In either case openings 68 are provided thereinin alignment with recess 64 so that a. hole 70 is provided through thebrick 6! The bricks 60 are laid in opening 46 in a plurality of verticalcourses with the openings 70 in the bricks of each vertical course inalignment on the cold face of the bricks. The bricks 60 also extendtoward the cold face beyond the inner edge of plate 8. A bar 72 passesdownwardly through each set of aligned openings '70 with the top of thebars bearing against the cold face of plate 8 and the bottom of the barsbearing against plate 10. Suitable means such as a lug 74 welded toplate 10 below the top thereof prevent the bars 72 from fallingdownward.

In either of the above embodiments it will be understood thatinstallation may be provided around the inside periphery of the frame 2toprotect the metal from excessive heat. The high duty refractory in theopening 46 may be provided in other forms than that shown. For example,the high duty refractory may be applied in whole or in part as acastable slab, or the metal cladding may be omitted from all or part ofthe bricks.

Other embodiments and modifications may also be made Within the scope ofthe attached claims.

I claim:

1. A furnace door having a hot face and a cold face, said doorcomprising an outside frame having two generally vertical sidesconnected at their top by a generally horizontal member at the hot faceand at their bottom by a generally horizontal member at the hot face soas to provide an opening at the hot face, a plurality of metal saidopening, means fastening said metal clad bricks together, means holdingsaid assembly of said metal clad bricks in said opening, an inside frameextending between and fastened to said outside frame at the cold face,said inside frame having two generally vertical sides connected by topand bottom members so as to provide an opening, insulating bricks insaid last named opening, a plate onthe side of said insulating bricksadjacent said metal clad bricks, a plate on the side of said insulatingbricks adjacent said cold face, means holding said insulating bricks andplates in assembled relationship in said inner frame in spacedrelationship with said metal clad refractory bricks to provide avertical opening, the bottom member of said inside frame being spacedfrom said bottom member of said outside frame at the cold face so as toprovide an opening therebetween whereby air will pass through said lastnamed opening and said vertical opening to remove heat from the metalclad refractory bricks.

2. A furnace door having a hot face and a cold face, said doorcomprising an outside frame having two generally vertical sidesconnected at their top by a generally horizontal member at the hot faceand at their bottom by a generally horizontal member at the hot face anda generally horizontal member at the cold face, said sides and top andbottom members providing an opening at the hot face, a plurality ofmetal clad refractory bricks in said opening, a plurality of generallyvertical bars Welded to said metal clad bricks at the side toward saidcold face and extending above and below said opening, a rod extendingbetween and fastened to said vertical sides in engagement with said barson the side thereof toward said cold face, an inner frame extendingbetween and fastened to said outside frame at the cold face, the bottommember of said inner frame being spaced from said bottom member of saidoutside frame at the cold face so as to provide :a generally horizontalopening therebetween, said inner frame having a vertical wall ofinsulating bricks therein between generally vertical plates, theinsulating bricks and plates being spaced from said metal clad bricks soas to provide a substantially vertical opening in communication withsaid horizontal opening whereby air will pass through said horizontalopening and said vertical opening to remove heat from said metal cladrefractory bricks .3. A furnace door according to claim 2 includingmeans detachably connecting said inner frame to said vertical sides ofsaid outside frame.

References fitted by the Examiner UNITED STATES PATENTS 251,528 12/81Damon 110-173 X 312,578 2/85 Nightengale 110173 1,391,197 '9/21 Law110180 X 1,864,333 6/32 Aldrich 110-173 2,387,594 10/45 Longen'ecke'r 110-173 2,426,568 8/47 Sontz 110-173 2,438,035 3/48 Bushman et a1 126-198X 2,475,102 7/49 Longacre 110-473 2,736,187 2/56 Coffman et al. 50-4162,764,887 10/56 DArnbly 50- 416 2,382,844 4/59' Romer 110-173 2,909,13210/59 Jankowski 110-473 X 3,081,752 3/63 Demaison 110-173 X JAMES WWESTHAVER, Primary Examiner. FREDERICK L. MATTESON, JR., Examiner.

1. A FURNACE DOOR HAVING A HOT FACE AND A COLD FACE, SAID DOORCOMPRISING AN OUTSIDE FRAME HAVING TWO GENERALLY VERTICAL SIDESCONNECTED AT THEIR TOP BY A GENERALLY HORIZONTAL MEMBER AT THE HOT FACEAND AT THEIR BOTTOM BY A GENERALLY HORIZONTAL MEMBER AT THE HOT FACE SOAS TO PROVIDE AN OPENING AT THE HOT FACE A PLURALITY OF METAL CLADREFRACTORY BRICKS IN SAID OPENING, MEANS FASTENING SAID METAL CLADBRICKS TOGETHER, MEANS HOLDING SAID ASSEMBLY OF SAID METAL CLAD BRICKSIN SAID OPENING, AN IN SIDE FRAME EXTENDING BETWEEN AND FASTENED TO SAIDOUTSIDE FRAME AT COLD FACE, SAID INSIDE FRAME HAVING TWO GENERALLYVERTICAL SIDES CONNECTED BY TOP AND BOTTOM MEMBERS SO AS TO PROVIDE ANOPENING, INSULATING BRICKS IN SAID LAST NAMED OPENINT, A PLATE ON THESIDE OF SAID INSULATING BRICKS ADJACENT SAID METAL CALD BRICKS, A PLATEON THE SIDE OF SAID INSULATING BRICKS ADJACENT SAID COLD FACE, MEANSHOLDING SAID INSULATING BRICKS AND PLATES IN ASSEMBLED RELATIONSHIP INSAID INNER FRAME IN SPACED RELATIONSHIP WITH SAID METAL CLAD REFRACTORYBRICKS TO PROVIDE A VERTICAL OPENING, THE BOTTOM MEMBER OF SAID INSIDEFRAME BEING SPACED FROM SAID BOTTOM MEMBER OF SAID OUTSIDE FRAME AT COLDFACE SO AS TO PROVIDE AN OPENING THEREBETWEEN WHEREBY AIR WILL PASSTHROUGH SAID LAST NAMED OPENING AND SAID VEERTICAL OPENING TO REMOVEHEAT FROM THE METAL CLAD REFRACTORY BRICKS